We need to leave Earth and explore other planets and solar
systems. Many of the resources we need can be found "out
there" and harvesting them would not pollute the Earth. Having
people on other planets would provide assurance that we will
continue should something happen to the Earth. Settlements
in other solar systems will provide assurance that humanity will
continue if something happens to our sun or our solar system.

Going to the moon was a necessary first step. We should never
have come back. We need to build a space station, we need settlements
on the moon and Mars, and we need to continue to explore the solar
system and the galaxy.

Other people feel the same way. Below are links to several
pro-space groups. Check them out.